Yeah, Barnaul is steel, and steel isn't as elastic as brass, so smut can collect in the chamber. Going from steel to brass, this symptom will show up faster. Shoot enough steel, it'll still happen, just take a bit more time, generally speaking.
Making sure that the chamber is lubed somewhat when using steel-case is always a good idea. Everything else (carrier, bolt, inside of the upper receiver) can be decently lubed, but if the smut that steel allows to blow into the chamber is dry, it can turn problematic. Lube the chamber a bit, and suspend that crud in fluid. I'd try this, the most simple thing, first.
Could be that the chamber needs reaming. If it's a true 5.56, a reamer won't hurt anything, so nothing is lost; almost diagnostic, in that case. If it's NOT a true 5.56, it'll help ensure a greater range of ammo types that can be shot.
Is it just me, or is that a distinctly extractor-sized chunk of rim taken off of that casing? Kartoffel pointed that out, too. Does that mean weak extractor, if it was on well enough to rip material off of the rim in the attempt to extract? I'm asking, not sharpshooting...


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